From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Return-Path: From: sbates@raithlin.com To: axboe@kernel.dk Cc: linux-block@vger.kernel.org, linux-nvme@lists.infradead.org, Damien.LeMoal@wdc.com, osandov@osandov.com, sbates@raithlin.com, sagi@grimberg.me Subject: [PATCH v3 1/2] blk-stat: convert blk-stat bucket callback to signed Date: Fri, 7 Apr 2017 06:24:02 -0600 Message-Id: <1491567843-26190-2-git-send-email-sbates@raithlin.com> In-Reply-To: <1491567843-26190-1-git-send-email-sbates@raithlin.com> References: <1491567843-26190-1-git-send-email-sbates@raithlin.com> List-ID: From: Stephen Bates In order to allow for filtering of IO based on some other properties of the request than direction we allow the bucket function to return an int. If the bucket callback returns a negative do no count it in the stats accumulation. Signed-off-by: Stephen Bates --- block/blk-stat.c | 6 ++++-- block/blk-stat.h | 9 +++++---- 2 files changed, 9 insertions(+), 6 deletions(-) diff --git a/block/blk-stat.c b/block/blk-stat.c index e77ec52..dde9d39 100644 --- a/block/blk-stat.c +++ b/block/blk-stat.c @@ -19,7 +19,7 @@ struct blk_queue_stats { bool enable_accounting; }; -unsigned int blk_stat_rq_ddir(const struct request *rq) +int blk_stat_rq_ddir(const struct request *rq) { return rq_data_dir(rq); } @@ -104,6 +104,8 @@ void blk_stat_add(struct request *rq) list_for_each_entry_rcu(cb, &q->stats->callbacks, list) { if (blk_stat_is_active(cb)) { bucket = cb->bucket_fn(rq); + if (bucket < 0) + continue; stat = &this_cpu_ptr(cb->cpu_stat)[bucket]; __blk_stat_add(stat, value); } @@ -135,7 +137,7 @@ static void blk_stat_timer_fn(unsigned long data) struct blk_stat_callback * blk_stat_alloc_callback(void (*timer_fn)(struct blk_stat_callback *), - unsigned int (*bucket_fn)(const struct request *), + int (*bucket_fn)(const struct request *), unsigned int buckets, void *data) { struct blk_stat_callback *cb; diff --git a/block/blk-stat.h b/block/blk-stat.h index 53f08a6..622a62c 100644 --- a/block/blk-stat.h +++ b/block/blk-stat.h @@ -48,9 +48,10 @@ struct blk_stat_callback { /** * @bucket_fn: Given a request, returns which statistics bucket it - * should be accounted under. + * should be accounted under. Return -1 for no bucket for this + * request. */ - unsigned int (*bucket_fn)(const struct request *); + int (*bucket_fn)(const struct request *); /** * @buckets: Number of statistics buckets. @@ -120,7 +121,7 @@ void blk_stat_enable_accounting(struct request_queue *q); * * Return: Data direction of the request, either READ or WRITE. */ -unsigned int blk_stat_rq_ddir(const struct request *rq); +int blk_stat_rq_ddir(const struct request *rq); /** * blk_stat_alloc_callback() - Allocate a block statistics callback. @@ -135,7 +136,7 @@ unsigned int blk_stat_rq_ddir(const struct request *rq); */ struct blk_stat_callback * blk_stat_alloc_callback(void (*timer_fn)(struct blk_stat_callback *), - unsigned int (*bucket_fn)(const struct request *), + int (*bucket_fn)(const struct request *), unsigned int buckets, void *data); /** -- 2.7.4 From mboxrd@z Thu Jan 1 00:00:00 1970 From: sbates@raithlin.com (sbates@raithlin.com) Date: Fri, 7 Apr 2017 06:24:02 -0600 Subject: [PATCH v3 1/2] blk-stat: convert blk-stat bucket callback to signed In-Reply-To: <1491567843-26190-1-git-send-email-sbates@raithlin.com> References: <1491567843-26190-1-git-send-email-sbates@raithlin.com> Message-ID: <1491567843-26190-2-git-send-email-sbates@raithlin.com> From: Stephen Bates In order to allow for filtering of IO based on some other properties of the request than direction we allow the bucket function to return an int. If the bucket callback returns a negative do no count it in the stats accumulation. Signed-off-by: Stephen Bates --- block/blk-stat.c | 6 ++++-- block/blk-stat.h | 9 +++++---- 2 files changed, 9 insertions(+), 6 deletions(-) diff --git a/block/blk-stat.c b/block/blk-stat.c index e77ec52..dde9d39 100644 --- a/block/blk-stat.c +++ b/block/blk-stat.c @@ -19,7 +19,7 @@ struct blk_queue_stats { bool enable_accounting; }; -unsigned int blk_stat_rq_ddir(const struct request *rq) +int blk_stat_rq_ddir(const struct request *rq) { return rq_data_dir(rq); } @@ -104,6 +104,8 @@ void blk_stat_add(struct request *rq) list_for_each_entry_rcu(cb, &q->stats->callbacks, list) { if (blk_stat_is_active(cb)) { bucket = cb->bucket_fn(rq); + if (bucket < 0) + continue; stat = &this_cpu_ptr(cb->cpu_stat)[bucket]; __blk_stat_add(stat, value); } @@ -135,7 +137,7 @@ static void blk_stat_timer_fn(unsigned long data) struct blk_stat_callback * blk_stat_alloc_callback(void (*timer_fn)(struct blk_stat_callback *), - unsigned int (*bucket_fn)(const struct request *), + int (*bucket_fn)(const struct request *), unsigned int buckets, void *data) { struct blk_stat_callback *cb; diff --git a/block/blk-stat.h b/block/blk-stat.h index 53f08a6..622a62c 100644 --- a/block/blk-stat.h +++ b/block/blk-stat.h @@ -48,9 +48,10 @@ struct blk_stat_callback { /** * @bucket_fn: Given a request, returns which statistics bucket it - * should be accounted under. + * should be accounted under. Return -1 for no bucket for this + * request. */ - unsigned int (*bucket_fn)(const struct request *); + int (*bucket_fn)(const struct request *); /** * @buckets: Number of statistics buckets. @@ -120,7 +121,7 @@ void blk_stat_enable_accounting(struct request_queue *q); * * Return: Data direction of the request, either READ or WRITE. */ -unsigned int blk_stat_rq_ddir(const struct request *rq); +int blk_stat_rq_ddir(const struct request *rq); /** * blk_stat_alloc_callback() - Allocate a block statistics callback. @@ -135,7 +136,7 @@ unsigned int blk_stat_rq_ddir(const struct request *rq); */ struct blk_stat_callback * blk_stat_alloc_callback(void (*timer_fn)(struct blk_stat_callback *), - unsigned int (*bucket_fn)(const struct request *), + int (*bucket_fn)(const struct request *), unsigned int buckets, void *data); /** -- 2.7.4